Taking Trimethoprim For The First Time

i'd tried to clear the UTI holistically by drinking gallons of water, cranberry juice, camomile tea and lemon barley squash, thought it was working but after a couple of days felt generally weak and feeble and my urine still tested positive for leucocytes and a trace of protein, so i caved in and decided to take the Trimethoprim. i'm always worried about taking antibiotics because of their weird side effects so i'm hoping these don't have too many, so far i've felt very tired despite having had several naps, i almost fell asleep on the loo. having eaten my evening meal i feel quite sick, not the kind of projectile vomiting i've had before with allergies but a sick feeling deep in my gut, i was ok after a light lunch so maybe eating little and often when taking these pills is best. i'm hoping these are the worst side effects i will get cos i can cope with them by sleeping all day for the next 2 days, it will be worth it to clear the UTI.