I find this interesting as well as I have heard and read this a few times before. Some say that true gyno can not be induced without a rise in estrogen. Although I am not sure I believe this theory because there have been many reports of gyno from compounds known to raise prolactin for instance deca or tren even with the use of LETRO! But I have also read that an AI is usually enough to stop progeterone or prolactin related gyno. so I am unsure where I stand on this. A clear cut answer from one of the smart guys around here would be awesome.
But OP, you can get some P5P which is a version of B6 vitamin, it is a natural way of lowering prolactin levels and is probably the cheapest route, or if you want you could grab yourself some pramipexole or cabergoline and they will for sure put an end to your excess prolactin, if that is the case.
If it is actually estrogen induced, I believe the usual advice on here is to take a low dosed AI in conjunction with a SERM in some kind of tapering method.
hope this helps