I’m 30 year old single dad. I function well and maintain everything 

I’m literally fucking at my wits end and I don’t know why, if it’s anxiety or I need to see a GP 

I had this issue 5-6 years ago where I was completely obsessed with my breathing, which has for some unknown reason returned. I think I may be hyperventilating at times leading to more chest tightness/ feeling short of breath but I don’t know. 

It’s almost constant and really exhausting, I bought a pulse oximeter, my blood oxygen is always 98-100. My pulse rate is around 50-60, bp 115-70, on paper apparently I’m pretty healthy, tried otc inhalers, ephedrine tablets, mucinex, nothing improved the feeling of being short of breath. 

Sometimes when I’m really focused on something I’ll realize that it’s fine and that tightness in my chest wasn’t bothering me. But it’s one of those things, like Trying to relax. As soon as I realize that I’m not doing it, I’m back doing it. 

Also random crazy shit like, being obsessed with watching my cars temperature gauge, and feeling it idle while I’m at stop lights, focusing on every bump in the road. Randomly worrying about asteroids hitting earth, or my daughter dying in some horrible accident. Sometimes I’ll freak out when she’s asleep because she’s so still and feel that she still breathing, she’s 5 so it’s not like sids is a real concern anymore. 

Not like, thoughts that come and go tho I’ll waste hours googling shit and trying to find mathematical percentages about the chance that I have lung cancer, or an asteroid will hit earth, or ill outlive my child ext ext. 

I haven’t actually been to a GP or any kind of regular doctor in over a decade. I don’t know what to do really, I don’t want to book an appointment with a Regular doctor and have them run a bunch of x rays and shit I can’t afford, or think I’m trying to get narcotic meds. 

I’m pretty sure these aren’t normal thoughts or behaviors, and just continue on my day to day life and try lot to talk about it much because nobody really understands. I literally can’t relax. If anyone reads this that’s experienced any of this help me out with some tips on how to treat this or what might be going on please