One does not stop it unless one never wants to generate any new ideas. What one stops is the imbalance and the sort of proactive procrastination it leads to, of

One does not stop it unless one never wants to generate any new ideas. What one stops is the imbalance and the sort of proactive procrastination it leads to, of always thinking about starting and never starting, and one does that by executing with commitment on some of the ideas. That'll chip away at that FOMO anxiety because you'll be focused on what you're doing rather than what you're not doing. At the end of the day, it's just going to be exposure therapy to the situation where you know you're not fully capturing all possibilities that gets you over that fear. You absolutely can't predict the future so you absolutely can't ever capture all the possibilities. Perfection is the enemy of choice. Don't make it complicated in your head, despite how loudly your gut screams at you that the risk warrants infinitely granular consideration -- just start and trust the idea(s). If you have too much anxiety, surround yourself with a support system you trust that you can rubber duck how solid the ideas are with. The rest will work itself out.