I've Had A Few Instances Lately Of My Resting Heart

I've had a few instances lately of my resting heart rate ranging between 150 & 170. I've recently gained about 40 pounds. I've made a conscious effort to change my diet. No fried foods or sweets. I've stopped gaining weight, but now I'm having some new feeling in my arms and hands and I'm concerned. I'm also dealing with a serious knee injury and some depression due to death in the family and the weight gain.