Do you think this is anxiety?

almost 3 weeks ago i quit smoking. i was having a hard time to breath so i admittedly quit. i dont have any cravings or anything. but ever sence then. i have to eat every 1 to 3 hours tops. and i cant eat as much as i use to. like before i could easly eat 7 slices of pizza now maybe 3. i did randemly have a couple anxiety attacks one i almost thought i had a heart attack. but it seems like i have constant anxiety now. like my heart doesnt race at all the highest ive seen it go was like 80 90. i went to the doctors and they said most likely its just anxiety. b.c i was having slight chest pains and hard time breathing. i havent really had as much of that lately. but now i more head aches in the back of my head.. not extreme ones but i could have them for hours. and i have a stiff neck. ive read so many things online witch prob wasnt a good idea lol. but most people with anxiety dont eat anything or just alot less. me i have to eat on average every 2 hours or i feel sick. ill randemly get lil pains hear and there. and sumtimes my eyes hurt a lil bit. i notice im more sensitive to smell that annoy my throat. ill randemly get diarrhea like 3 times then not crap for almost a day, today i just feel drained and have a head ache. i feel like im low or high on sumthing. it bothers me. and i havent been the same for the last 2 or 3 weeks. if u wanna ask more questions ask. but plz give me your feedback. im 19 male. 300 pounds height 6 1. i have normal physicals and they never have anything bad to say. oh. the doctor did mention that i might have diabetes. because i have rough brown skin on the back of my neck. witch is a sign. i just dont know if i got nicotine withdrawals diabetes and anxiety all at once. i only smoked for 2 monthes but i smoked like 3 to 7 cigs a day everyday.Do you think this is anxiety?
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