Hello My Name Is Christine, I Am 38 Years Old

Hello my name is Christine, I am 38 years old 5'11" & 265lbs. I have an under active Thyroid, & have been classed as pre-diabetic & with hypertension. I take Synthroid 150mcg, 1 daily, Teva-Hydrochlorothiazide 25mg, 1 daily & Reactine 20mg 1 daily for allergies. My average reading for my blood pressure is at 148/90.My sugar levels have been fasting 6.2, 2 hours after eating 8.1 at the max.
My husband & I are have been trying to get pregnant for the last 3 years & The Nurse Practioner I have seen twice has been really nasty & rude. She persribed methyldopa 125mg tablets to be taken twice daily. I haven't filled the percription just yet because I'm not really sure what to do she never told me if I have to keep taking my Teva-Hydrochlorothiazide or what to do. I'm really wary about what to do can you please help