My friend had miscarriages into high double figures. The NHS couldn't find anything wrong with her. She emigrated to a country with private medical insurance as standard, and was promptly diagnosed with Coeliac disease. After she cut out gluten, she went on to carry healthy, to term pregnancies.
My bastard GPs won't let you talk about more than one or at the most, 2 things bothering you at a time. So no way they would allow themselves to hear about more than one symptom in order to get the full picture of a potential condition.