I'll add my own experience now.
When I was ten years old, my parents invited a female travelling preacher to have a prayer meeting at our home. At the time, I had various concerns of my own, and she prayed for me - and then blew on me. When she blew on me, I fell over completely involuntarily. But more than that - I could see myself lying on the floor, I was looking down on myself from the ceiling. I felt his love and care all around me - I did not feel like I was lying on a floor, but like I was floating or supported in His arms. I did not stay down for long, it was an unusual experience and I got up fairly quickly.
For me, this was a pivotal moment in my faith. It was the time that God moved from being head-knowledge, to me knowing that He was truly real, as I had felt His power (however unusually). From that day on my faith in Him was immovable - I could change my opinion on details, but could never have any doubt that He was actually real, and actually interacting with the lives of people today.
Going by the fruit of that event in my life, I have no doubt that this was truly the Holy Spirit.
Following that event though, I went to various other services and prayer meetings where this was occurring (it was quite widespread for a time). I was prayed for on one or two more occasions, and felt this less strongly each time. Increasingly it felt like people were trying to push for this outcome, and it was less real and more forced as time went on.
I feel that God has truly used this method to reveal His power and presence to people, when it makes sense for them individually, as He did for me. It is a mode of revealing Himself that probably resonates more strongly with women and children (which explains the number of women at such meetings). It is an emotive and pleasurable experience. But this means that it is something that people want to experience again. Because feeling God's presence that closely is awesome, who wouldn't want to feel close to Him? So people seek it again, and again, and try to recreate it. They use worship music to create the right "mood", to work everyone into the correct emotional state, to try and make this happen. And it becomes artificial.
When this happened to me at the age of 10, I was in a small meeting in a house. No worship band to set the mood and manipulate people's emotions to achieve an outcome. Just God's Spirit moving among His people who were seeking Him. This experience was real. But later times when I witnessed it in more churchy settings, and even sought it again myself (don't criticise - I was 10 years old!), it was less real or not real at all. Because it is not our business to try and manipulate God into giving us an experience. That's His decision.
So I think this can be anything from completely 100% God, to completely 100% emotional fakery with no spiritual component at all. At times there could be demonic influence, however I feel this is not a demonic experience, as everyone involved is trying to seek God and He knows how to give good gifts to His children when asked. I do not believe somebody who is genuinely seeking God and His Holy Spirit will receive a demon instead, just as a child who asks for a fish will not receive a snake. However, a demon may encourage them to keep seeking God in a way that the demon knows God does not desire, and will distract from finding the true path that God has for their life. And this is a distraction that holds more appeal to women and children than to men, so they can more readily be emotionally influenced to chase it, hence why so many women end up at such events.
At the meeting we were at a few days ago, this was very much pushed by people not a movement of God. I believe that what Sarah experienced was God, but a mild "ok, since you're all bothering me about it, here you go, but that's not really what you should be focussed on" sort of experience. Or something like that. The people there were not really focussed on the needs of the people they were praying for, they had an idea of what a "revival meeting" should be like - people falling down all over the place - and just focussed on trying to achieve that. I'm not worried about her experience myself, but it's bothering her, hence why she's asked the question here. I'm glad she's asking that question and trying to get it all clear in her head.