30 years old - Male - 200 lbs - 6'0''

Medication: Recently (1.5 months ago) switched from 40mg Celexa to 50mg Zoloft (for General Anxiety Disorder and Panic Attacks... Celexa finally pooped out in early 2021 after 10 years of working super well for me)

Sleep/Diet/Exercise: I get about 7 to 7.5 of actually asleep hours per night (according to Fitbit). I sleep on my stomach. I eat about 3k-4k calories per day. I do intense exercise every day (mostly cardio) where my heart rate reaches up to 205bpm (above my "max heart rate"?). Kind of like high intensity interval training.

About two weeks ago I started getting something I would call spasms in the center of my stomach/chest right below my rib cage. I sleep on my stomach so when they happen it can be hard to fall asleep. They also happen during exercise occasionally or when sitting with bad posture.

I've tried to start eating more bananas, nuts, watermelon, almond milk + whole grain cereal, and veggies (broccoli, asparagus) in case this is just some kind of acid reflux flare-up. I started this about a week ago and haven't seen much of an improvement.

I want to make sure that going up to 205bpm in my exercise is not going to hurt me. I live stream my exercise with a heart rate monitor and my viewers were saying I should not be pushing myself that hard. I was wondering if the spasms could be something to do with the intense cardio or if they are more likely just some kind of stomach issue from Zoloft (I've only been on 50mg for 4 weeks now), my diet, or just my general anxiety?

My therapist seems to think it is diet related so I will continue doing the diet stuff, but I want to see if others have experienced a similar phenomena and what they caused it/helped it, etc.

Thanks!!