Hydrochlorothiazide and high blood pressure

Big weight gain in the past 6 months (40 pounds), sleeplessness at night, mental and physical fatigue, hand joint pain, feet pain. I was taking a low-dose anti-depressant, which I stopped taking. All symptoms remained. So, I'm going to stop taking 25mg HCTZ for my mild high blood pressure, and will start walking again once my feet feel good enough to take the exercise. I will research natural herbal remedies to help me lower my hypertension, and with the walking, hope to lose weight which will help lower my blood pressure, too.

33yr. old/male 5'8", 170lbs.
I just switched from taking Lisinopril 10mg for 2 weeks to get rid of memory loss issue, dizziness, lethargy, etc. Now I'm on 25mg of HCTZ and I'm having worse issues with the dizziness, tired, lethargic, dumb, drunk, dopey feeling that won't quit. The only other med that I take is Allegra-D 12 hour once a day for the last two years. I saw that high blood pressure was a possible side effect of the Allegra, but my doctor said he was pretty sure that wasn't it since my cholesterol was also high (210). I have to find something to lower my all of a sudden high blood pressure 195/100 to a comfortable level without these life hindering side effects. I have a lot of living left to do and I'm pretty fit, but now since I started these meds, I feel like I'm 70 yrs. old.