Inattentive ADHD diagnosed at 30, seeking advice for sleep and medication management

Hey y'all, I don't know how you guys do it but my recent diagnosis of ADHD later in life has me absolutely floundering and wildly unstable. I need treatment but I feel like I'm cursed due to all the fuckery of different labs and quality control issues. Every time I pick up my prescription it's a roll of the dice to see what lab I'm getting and what side effects I'm going to have to endure for the next month.

It's been about 6 months since I started medication, first with generic Adderall XR 10mg, then up to 15mg before feeling like I had to stop medication entirely due to unpredictable inefficacy, insomnia and gastro issues from all these varying labs and their different versions of "Adderall." My ADHD symptoms got much much worse after stopping for a week or so, then my psychiatrist suggested trying IR generics instead.

I started up again at 5mg 2x daily which had me crashing way too early in the day (I'm self-employed and work 12-15+ hours a day and couldn't make it past the 12 hour mark before crashing hard). This month I got bumped up to 5mg IR 3x daily and the lab changed again and now this version is hitting way harder and I'm back on the good day, good sleep/bad day, no sleep cycle again.

I fucking hate instability and am desperate to find a normal sleep/wake/work/life routine again.

A couple ADHDer friends of mine are taking Vyvanse and said it's the best out there - is it worth it? I'm paying $15/month for my generic Adderall but Vyvanse would probably cost me $250/month I'm guessing? If it's as smooth as they say it is though, well then fuck I guess I'll go for it if it helps me get my impulse control, focus, drive, stability and happiness back at any level better than all these shitty generic Adderall pills.

Any ADHD veterans out there willing to share some input?

Thank you <3