What Causes Pain In The Upper Stomach And Bloating?

I am a 66 year old female, my upper stomach hurts, it feels full and bloated, I exercise daily, I haven t eaten much food in the last week or so because I m trying to lose my tummy fat, but I feel as though I need to use a laxative or something along those lines, but I don t want to put anything in my mouth, liquid or food because it makes it feel fuller, It hurts my stomach to sit casual on a chair or sofa, I have to stretch my torsal to take some of the pain away. I feel clostephobic I have the bloating and I feel as though it should come out and not closed in, I don t know if this is a panic type attack, but 3 weeks ago, I had this same feeling plus I feel like I need to throw up to relieve the pressure in my stomach. I am 5 4 and weigh approx. 129