I'm a 47 year old male. My MD put me on Lisinopril 3-4 weeks ago...

I'm a 47 year old male. My MD put me on Lisinopril 3-4 weeks ago. I've always been healthy till this point but my BP is on the high side so... This is the first time in my life I have been on medication that has lasted for more than a few days. Last week I started to get some minor stomach pain. Its been about 7 days now and my MD told me to stop taking the med which I am more than happy to do. Its too early to tell if the pain is connected to the medication, I hope it is because some of the other possibilities are really unpleasant to think about. I've also been constantly tired and my wife tells me I am more withdrawn.