do your stools routine test and sos colonoscopy
it may just be an infectious diarrhoea
donot eat anything uncooked outside the house.
try to get some sleep in the afternoon to make-up for your quota of sleep.
the lump in groin may be a lymph node and may go away after a few antibiotic course prescribed by your colorectal surgeon or a general surgeon
. You should get examined by these specialits first rather than jumping on trial and error method of self medication
which can be very harmful.
wish you good health