When you see your doc, I'd say ask for some pretty serious lab work. Your sudden weight gain concerns me as I know it does you, you doctor and all of us here. And, you say your depressed? Due to the weight gain? something else that may have contributed to the extra pounds - from extra calories not balanced by exercise?
I assure you that exercise alone (till you sweat profusely for at least 20 minutes per day) will take pounds off; and, increase your natural anti-depressants (endorphins - yes, yes, yes - your endogenous opiates *are* anti-depressants. Science knows that opiates change the reuptake of serotonin and similar mood altering endogeneous chemicals. Plus you'll be *very pleased* with yourself for accomplishing the exercise program you before now could never really "get off the ground." There's no easy way, and looking for one , as many will agree, is *the problem.*
Since you are going to get treatment or do it yourself, as you admit, perhaps Prozac or Ultram might help curb your appetitite, and, put you in a better frame of mind/attitude for launching that much-need exercise regime. Ultram is a perfectly fine anti-depressant. Tell us what you're already taking besides BP meds? And then maybe we can help much more

But IMO first talk to Doc, 2. get blood work to rule out underlying problem 3. Discuss the best medication , and, consider psychotherapy (counseling) as an adjunct to your medication; eliminate as much negative self-talk as is practical for you. At least identify the nature, frequency and duration of self-talk - which is of course usually negative unless you've already solved such a problem.
What did you do or not do during the time you gained weight? What had happened, if anything, before the time at which you believe the weight starting going up?
It's a must to consider all the antecedents, behaviors, and
consequences of your actions (those nifty ABC's of understanding ones' behavior, or 'nature' if you prefer).
Don't say you need to loose 25 lbs. That's physically impossible, but you can loose say a pound per week? That may be a reasonable objective, the goal being to get your weight at "x" lbs. But I can't help thinking that the underlying cause is what needs to be examined and remediated. Given the history of high BP, I can't help much and the ideas I presented may not be medically sound, but do discuss (and independently research) the types of meds that you can take which are not contraindicated with your BP meds. Consider a second opinion. And, even if your blood work looks normal, they may not have looked at your hormones; I would definitely get that checked, especially with regard to your age.

Looking to pill(s) for an answer?? This is by far the easy way out, but not without some costs to your body, mind, and spirit; and don't forget you are 3 things
(body,mind and spirit --if that perspective hopes - I hope it does!!).
Since pills are the easy way out, you owe it to your body, mind and spirit to supplement the pills with other things like exerices and/or counseling; if for nothing else then just to examine your lifestyle and what is going on now versus before the weight gain, etc., etc. Find a buddy. It's easier that way - like ya know find a sparring partner, put on the gloves for your hands and feet and start punching and kicking Best if kept off the board. You'll likely figure out something very exact as to the cause of your problem, then beat the pulp out of your problem (symbolically at least!).
In a word or two: get serious; get mad, then glad.
Be Happy

Good luck at the Doctor

MT aka Foxfire48