*Wow, I am sorry to hear that your hair loss issues are getting worse.

Are you seeing a dermatologist for this at all? (I am not sure if you can get all of these medications over the counter). If not, that would be my first suggestion. Aside from that, perhaps you have developed some additional medical conditions that are thinning your hair/making it weaker?
I can tell you that I have multiple issues that cause my hair loss. Two of them are Seborrheic dermatitis (dandruff) and atopic dermatitis. The treatment I was told to do (I think it is for both conditions) alternate between three different shampoos: ketonazole 2% (strength only by prescription in US), a shampoo with salicylic acid, and a shampoo like head and shoulders or Selsom blue (there may have been other options too). I was told to wet my fingers, apply it to a dry scalp and leave on for 10 minutes, rinse in shower, and follow with a conditioner.
As far as the oral medications go, are you saying that you have had stomach issues and you think the medicine may have been expelled from your body before it had a chance to work? If so, I would say this is entirely possible. But as I previously stated, a doctor, preferably a dermatologist would be the best person to ask. I would even do so if you were interested in trying the shampoo strategy I am using. Just because something is over the counter, doesn't mean that it won't do you any harm.
*I saw that this post was from five months ago; I responded as if this post was new, in case I could still be of some help. How are you doing now? Take care!