> I’m not sure if everyone has gone through this, but for me I suffered through thoughts like: Will I be ever successful? Will I ever be happy? Will I ever have another good idea?

These seem unanswerable/pointless, assume whichever is more likely to go in the better direction.

> Was my idea good? Can I have good Ideas? Can I be good at anything?

Thinking about the whys or hows to these might get you somewhere.

My question that wasn't easy to find one/many 'yes' cases to is Have I ever had a truly original idea (not related-to/derived-from anything else) in my life? Good thing success doesn't depend on originality.