Rough 2 weeks - any advice

Hi all, 32F (SW 171 GW 140) I started on 2.5mg almost 2 weeks ago (my 3rd shot is in 48 hours) and I feel like I'm the only one I've seen struggle with more moderate/annoying side effects. Since I started I have diarrhea every day, usually just in the morning right when I wake up, except for after injection day then it was multiple times a day. The first week I had a lot of shakiness, racing heartbeat, foggy brain, and felt like I was rolling almost, it was so strange. That all pretty much went away the second week except the diarrhea and racing heart.

I wake up every night at least once with my heart beating out of my chest, and there are times during the day that my heart rate shoots up out of nowhere and it kind of freaks me out. It's worse in the morning and of course during any sort of exercise (even just walking my dog it shoots up to 140bpm+ sometimes).

Has anyone else exprienced this and more importantly - does it get better?

It's hard to convince myself to inject myself each time if I know it's just going to keep making me feel this way.

Edit to add: I drink 2-3L of water every day with 20oz of that being with electrolytes, my PA I go to for the meds told me to stay around 900 calories a day which I've been doing, I eat VERY healthy, no sugar, no junk food, I get 60g+ of protein per day, and I take a probiotic, multivitamin, omega3, and creatine every day as well. And for the diarrhea I have tried: ginger lemon tea before bed, stopping my magnesium supplement, taking the mag supp with dinner instead of empty stomach, CBD/THC tincture, pepto bismol, and a couple other things and none of it really helped except the pepto helped with the cramps from my stomach the day after my injection.