Did you ever find out the cause of your problem. I've had the same problem for years. Doctor's always tell me I'm fine. What we have in common is I was diagnosed with Hashimoto's as well. The difference is I have the metal smell for months at a time, then it goes away for a few weeks and comes back. I don't know what to do at his point. I went gluten free this month which helped alot of other issues I've been having, but not this one.
Also I have a high level of bilirubin found that out through blood tests... I have been diagnosed in the past for Hashimoto's Thyroiditis... but stopped taking the levothyroxine and my blood has been normal. I use to drink excessively and still sometimes do.... I smoke cigarettes but have developed bronchitis/sinus infection and now will have to go on meds to quit- doctor's orders. I have used drugs but have been clean for a year and a half. I have had some gastro problems, kidney infection, uti's... I do not get the discharge problem^^^ everyday either(usually only after having sex a couple of times) But I really need to get it under control or Im going to lose it soon. I take probiotics and eat healthy. I have been to alot of doctors about this.... everytime the doctor says Im fine... I know there is something up... I also have irregular periods.