I didn't have any physical symptons beyond the first week of quitting drinking but everytime i quit smoking (I'm a serial quitter) I have all those symptons. I've quit smoking for 5 years at time twice and dozens of times for 3-6 months and with smoking the symptons lasted about 6 wks for me. Our bodies seem to be much more susceptible to germs when we quit smoking too cause just about everyone I've known who quit seemed to get a lot more aches/pains/colds/flu like symptons for at least the first year.
Congratulations on your 37 days!