Struggling with Cannabis Withdrawal: Need Advice on Managing Weight Loss

So I live in California where cannabis is legal and I have used it consistently the past couple of years to help boost my appetite since I already had none and help with my daily nausea. I am moving to Alabama soon where cannabis is illegal so I am trying to quit. My issue is when I quit I lose a dangerous amount of weight. In the past year I’ve taken 3 2 week long THC breaks and will lose 15-20 pounds during that time (I’m 5’5, 140, weightlifter). I honestly don’t know if I can properly feed my body without it. Am I able to request a feeding tube from my doctor? I am in so much pain and constant nausea I just don’t know what to do anymore.