reassurance for health-paranoid ppl? should i just jump in?

Finally got prescribed both min and fin, but now I'm getting cold feet lol. I just tend to be extra conscious about what I put in my body and how medications will affect me, but I'm also determined to start treatment sooner than later, since I'm at norwood 3 at 27. Now I'm wondering if I should just start one of them before diving into both, see if just one works for me, or if I should just suck it up and go all in and stop worrying. Any experience from ppl who began with similar concerns?