Whats wrong with me ? Am i just crazy?

Hello first of I will give you an overview about myself. I am 23 years old I would say in decent health. I work out a few times a week. Im 5'10 and weight about 190 LBS. My build is more on the muscular side( little bigger than average size) I try to watch what I eat as much as i can as i live in a household that doesnt really live a healthy life style (eating-wise). Recently about a month ago I have been tryin to stay focused on bettering myself and my lifestyle. I stopped smoking Marijuana as I think it was gettin to my anxiety problems. Every time i would smoke i would get really paranoid and would focus on my heart beating and almost scare myself into an anxiety attack. I found when i dont smoke it doesnt happen. So im just a few days of of marijuana. Since trying to get my life back on tract i noticed a few things. I can feel/see my heart beat in my stomach just above my belly button and just below my sternum. I never noticed it until now.. maybe something to do with losing weight? Also I thought i may have kidney stones.. but I am in no pain and no blood in urine. Im never in pain.. just a few things feel differnt. Also from time to time i feel a weird sensation just under right shoulder blade that feels like someone is lightly touching me with one finger then will move down about 2inches Almost like the feeling you get when a bug moves across your skin.. Again nothing hurts but it just feels weird .. maybe im over thinkin things but these are feelings i never felt until I stopped smoking and started workingout/watching what im eating. I notice that I can see my ribs more now than ever but im sure thats to be expected when losing weight. Maybe it plays in with my nerve damage i got a few years back. I have sciatic nerve problems from an accident at work many years ago on my right side which is the side i have the feelings i mentioned above. I just find it weird when Im trying to better myself I get these feelings lol again nothing hurts and at best could be labeled as a slight discomfort. any and all info would be great thank you!