Marijuana Withdrawal make you feel weak ?

Hi , im 18 and iv’e smoked marijuana for about 7 months now daily and iv just decided to quite after taking a trip to florida and feeling the withdrawal. i decided better stop now b4 the withdrawal gets worse. i feel really down and moody all the time , my muscles feel weaker than normal , and kinda shakey when i lift things or for various movments. i’m tired through peroids of the day then feel normal. i use travel pills to help me sleep which work well. and somtimes i get constipated . i was wondering if anyone else felt these, mainly the weak tired feeling . plus i wanna go to the doctors to get a checkup which will involve a blood test and prob a urine test . do u think they will detect the THC after a week or 2 of not using it. and if they do would they care? thanks