I've been diagnosed with slightly low vitamin d deficiency. when I take the low strength tablet about 10ug or 400iu I actually feel less depressed but the only problem is that after a period of time I start to get blood in my stool and a bad cough. is this my body getting used to it? should I persevere or should I stop taking the tablets and look for another method of obtaining vitamin d like cod liver oil?

strangely when I stop taking the tablets my symptoms (cough and blood on toilet paper) disappear but I feel depressed again.

feel like I cant win