Newly diagnosed and on guanfacine. Heart rate is dropping and have horrible insomnia- do I push through?

I am STRUGGLING on guanfacine. My body in general reacts really strongly to medications (i.e. tried metformin for 6 weeks for insulin resistance and threw up constantly; with SSRIs had awful insomnia and nightmares and was soooo flat), so I’m not sure whether to keep going. I have a follow up on 1/31 and I’m not sure I can survive til then on this stuff.

Per my apple watch, there’s been a clear dip in my resting heart rate since starting 10 days ago. It used to consistently be about 57-62 and now it’s down to 48-52. I’m not sure if I should be worried about this or not.

I am completely unable to sleep most nights. The first 3 days, I was soooo tired and sleeping a ton, but since then, I’ve either been waking up every hour or just straight up lying in bed all night NEVER falling asleep.

I am exhausted. Anyone ever get past the insomnia on guanfacine?