Can Poor Diet, Lack of exercise cause weight loss and...?

So close to a month ago i moved in with my brother. Before that we were living with my parents who always had a stocked fridge with fruits, vegetables and all sorts of food. I also used to ride my bike about 10-20 miles maybe 3 times out of the week and i was feeling great. When i moved i stopped riding all together while i settle in and my diet has been pretty bad. I Eat 1- 2 times a day. Either fast food or something small. Since then ive dropped a lot of pounds, i epically look thinner in my stomach and under my ribs. I feel like i look very boney. my body aches and i go through heat flashes, skin is more dry, also breaking out with odd skin rashes and etc. hair is more course and dry. I went in for a blood testing who was recommended by a nurse who said it might be a thyroid problem. The results were negative. Im a 20 year old male. 5'6 140lbs. Could this be the source to all of my recent symptoms? My blood pressure and temp were normal. I experience fever like symptoms at times. My mental health and mood has been very poor and i feel very anxious and heavy anxiety. I smoke a lot of pot and have been drinking a few nights out of the week. Today i went on my frist ride in a few weeks about 6 miles and i feel so out of breath. I cant really see any medical attention at the moment. Any info on this would be much appreciated. Also any info on an improved diet with a very low budget.Can Poor Diet, Lack of exercise cause weight loss and...?
Old school healthy and cheap diet for anyone who lives on 20 bucks a week. 5lb bag of potatos, 5lb bag of oranges, and spend the rest on tuna....the cheap kind. Eat 2 raw potatos a day.. Shouldnt be hard for a pot smoker!!!! Seriously, do you smoke alot of pot, and wonder why you feel like crap???? Try not smoking the pot and cut down on the drinking...Concentrate on feeling better!!!!Can Poor Diet, Lack of exercise cause weight loss and...?
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