25/M Slight Chest Tightness

Hey there,

As title notes, I'm a 25/M (~210lbs, white) and I've been experiencing some strange symptoms for the past couple days. Was hoping I could get some insight from some of you.

I was diagnosed with hypertension just under a year ago but have dramatically adjusted my lifestyle and have been taking my prescribed Lisinopril 20MG. I'm down from 250lbs and completely sedentary to ~210lbs and running 4-5 days per week (~20 miles/wk). I also recently switched to a plant-based diet (no meat, cheese, dairy in well over a month). Last time I saw my primary care physician (~3 months ago), my bloodwork indicated my triglycerides and cholesterol were slightly elevated, but he didn't seem to worried about it given my dietary changes. If I had to guess, I'd think my saturated fat, dietary cholesterol, and sodium are well under the recommended amount given my change in diet.

Fast forward to Sunday and I've been experiencing a strange sensation in my left upper chest, relatively near my collarbone. I've also experienced stiffness in my left elbow but originally thought that it might have something to do with my posture at work (sitting with my elbow on a desk) and/or maybe irritating it while working out. The chest pain is barely noticeable and I wouldn't even call it pain...it just doesn't feel normal? It is on and off throughout the day; though it is typically slightly worse in the mornings. It seems to disappear while running and for a couple hours after it. It just gradually starts and stops over 5-10 minutes and happens maybe 5 times per day. If I had to describe the pain in my chest, I'd say it just feels like a small amount of pressure. No real pain, pinching, sharpness, etc. just a gradual pressure.

I put these symptoms in WebMD (so I'm slightly starting to freak out) but was hoping somebody could shed some light. I think I included most relevant information, but please let me know if I missed anything.

FWIW, I have been very stressed since last Thursday (noticed the discomfort on Saturday/Sunday) -- I was offered a new job on Thursday but have been completely torn on whether I want to take it. Not sure if that increased stress could be the cause, or if it's something more serious.

Thanks!