There are presently 56 pages of complaints about lisinopril.
Reading through them, there are a number of people who have weight issues due to lisinopril. I have had them myself. I used to be able to control my weight by just jogging a bit more, but while on lisinopril - and for a long long time after, no amount of jogging helped. I also started feeling more and more exhausted and finally couldn't even sustain a minimum amount of jogging.
You should consider getting off lisinopril before you catch any of the other side effects, as they can be debilitating and extremely long lasting, perhaps permanent (even after quitting).
You might consider supplementation with L-Carnitine or Acetly-L-Carnitine for increased energy and fat burning metabolism. (I have also found L-Glutamine to be helpful on my stomach - the lisinopril gave me lots of stomach problems, among other things.)
My opinion of one thing that's going on with the lisinopril is that it places a heavy (detoxification) load on the liver, and as a result the liver is not able to produce the same level of the so-called "conditional nutrients", such as L-Carnitine (important for fat burning metabolism) and N-Acetly-Cysteine (important for lung health, e.g. to fight the cough). As this medication shifts the primary function of the liver from normal operation to heavy detoxification, it also uses up valuable minerals, such as zinc and manganese, and vitamins, such as vit-b group. Eventually, these nutritonal depletions will result in some complex side effects, energy, and health issues (in addition to the other more directly-caused side effects like the cough).
I also believe that supplementation is the best way to get some of these nutrients. You'd have to eat a ton of food (and gain weight, which is counter productive to hypertension and other health issues) to get the specific nutrients that are being depleted.
Best of luck to all.