Everyone reacts differently.
a few years ago I tried quite a few different ones, my stomach wasn't really the issue, it was more nausea, dizzy, just feeling crap.
since my stroke, I'm in a cocktail of drugs £ feel bloody awful but don't know which or which combination is the culprit.
i take 109mg of Losartan in the morning & 1mg of Doxazosin at night. (In hospital they tamped it up to 2/4/8 in a few days & I was really unwell in that. They dropped if totally when I came home, but BP was still a bit high, so put me back on 1 mg.& increased the Losartan from 50 to 100. One consultant said it was better to be on smaller doses of several different types than a bigger dose if one as they all work differently.
plus as much as I hate to say it, you do need to persist & give your body a chance to get used to to it.
Though 6 days of pregabilin (for nerve issues, not BP) was the most I was prepared to give it, the side effects were getting worse day in day & the dizziness became intolerable!
best of luck x