Explosive type symptoms and conditions

II'm a 54 year old male and I've been taking Lisinopril for about 24 months for moderately high BP (135/85). Initially, I was fatigued late morning, but that seemed to go away in a month or two. Having a previous back condition, I didn't blame the tightness in my glutes and legs on the pill or the extreme morning soreness, but now I wonder. Also, in six months I gained about 50 pounds with no change in lifestyle (205 to 255). I read in a few of the Drug Co. sites that this is a rare effect, but not in any postings here. Anyone else have this problem?
I also seem to have developed an explosive type of temper that I don't recall before, blowing up at minor things, then it quickly passes. Anybody?
Where the drug initially lowered my BP to 120/75, with the weight gain I need the drug to keep it in the neighborhood of the original problem (140/85). If I miss a dose it spikes to 170/115 or higher, so I'm basically forced to take it or another BPM where originally I had a very minor problem. I thought this was a common pill that was described as relatively benign, but I' starting to realize that's not the case at all.