I really encourage you, hajjj to stay on the path of seeing a psychiatrist. As you've had thoughts of killing yourself, this is serious and your life can depend on it. Please know it will get better. It doesn't matter what kind of psychiatrist at this point. You can see your primary care doctor for referral but be honest about the suicidal ideation. I do agree that if the thoughts of suicide become significant, an emergency room is the way to go and don't be afraid of this. This is how you get help! Let us know how things are going!
This is what anxious people tend to do, which is obsess over things. You get an idea in your head and just can't let it go the way you used to. If you're in fact feeling suicidal, you need to go get help ASAP. But as for the obsessive thinking, this is what depression and anxiety are, obsessing over things and getting incredibly frightened about it. Have you ever considered seeing a therapist to see if you can change this way of thinking?
We are so sorry you are going through this difficult time. Please have hope that it will get better! We have sent a private message to you with some information. We wish you the best.