Phil06 if you are researching these things out of interest, that's fine.
But if you are researching out of fear then it is a pointless exercise that ensures that you are kept in the anxiety and OCD loop.
If you've read on here about my experiences with existential anxiety, then you will know I have suffered for many years with it, so believe me when I know for sure that it is a total dead end. You will never have the answer! You will never know the truth of why we are here or who put us here. Sit with that.
Feel crap right? That's fine... let it. That feeling will eventually disappear.
If you don't want to think about solipsism or existential questions, you need to
1. stop researching more about it, not out of fear but to just give your mind a break really
2. The thoughts you do have, and the things you have read, go through each one by one - Yep, go TOWARDS them - and really think about them and feel that anxiety. Then realise, when it passes (because it will) that you are bigger and more powerful than these thoughts AND these feelings. Yep - you are bigger and more powerful than the biggest, scariest existential thought out there! You can go through the fear and out the other side EVEN with your scariest thought! That means that it means nothing!
3. Realise that these are all theories and ideas that imaginative people have come up with. They are not facts. You can believe in anything and it will have as much weight as believing in what that scientist thinks. We are all humans. We may have our ideas but we all actually KNOW as much as each other about why we are here.
4. Then you get to a place where you realise you are free to choose what to believe. So go religion/belief/philosophy window-shopping and find one you like! I chose Christianity as my belief because of my personal experiences. Or have no belief. That's a choice, too.
Remember - it still isn't the fear of the thoughts you are having. It's a fear of the feelings. Thoughts are neutral. Thoughts are images and information but they are not feelings. FEELINGS come after thoughts. They feel either good, or bad. It's the bad feelings that you are scared of, not the thoughts. So go towards those thoughts that create those feelings and feel those feelings. The feelings will then over time detach themselves from the thoughts because you are no longer scared of the feelings that you associate with the thoughts, because you go TOWARDS them instead of away from them, and thus, rendering their whole need to exist as pointless.