I took a fair bit of ferrous fumarate for 2 weeks, with vit c. about 45mg/day in week 1 and 24mg/day in week 2, in divided doses. i've had left shoulder pain and tiredness for about 5-7 days. i went back to 14mg/day today. did i really screw up?

I can't see where the meds or doses you mentioned would produce harm or relieve any symptom except by chance.

It is unlikely that the medications you mentioned and the schedule of taking these would have any adverse effect on your health. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV vaccine. Wish you good health!