help! my pharmacy switched patch brands and now i’m miserable

hello, i’m hoping someone here can help. i started on estradiol .025 a couple of months ago. the patch brand was mylan. last month my pharmacy switched my script to sandoz without telling me because of the shortage. ALL my symptoms have come ranging back. my hot flashes are worse than ever. i just called the pharmacy and said i can’t get mylan until september but they can order amneal. does anyone have experience with these brands and/or tell me where to obtain mylan? i will be calling my doctor monday first thing but in the meantime, i’m sitting here in the AC roasting from the inside out and LOSING IT!