First, YOU CAN DO THIS.
The typical physical stuff lasts about 7 days on average, with peak at about day 3.
The mental stuff lasts as long as it lasts. The anxiety monster DOES go away, so give it time.
I found in 3 months I was pretty good and traveling on a plane, in 6 months, so so so terrific, one year, a new person, 5 years, a totally happy person, YOU CAN DO THIS.
have vitamins, tv dinners, ensure plus or comparable, whatever beverage you like and a lot of it, plenty of white cotton socks so you can keep changing them because your feet will sweat, and in this sacrifice you make for yourself, you are giving yourself the best give anyone can give anyone, and YOU deserve it.
I hope to hear you are on your way through that dark tunnel and will be out here in the light with me soon.