OP, please take jedberg's advice. It may seem like "Well, if it could be a tumor, why wouldn't the specialists have mentioned that possibility?" but it turns out that doctors often overlook corner cases. It was surprising.
There's stigma about self-diagnosing, but if you've got a little sense it's a very good idea to do so. You may well google your exact signs, symptoms, and circumstances and find the doctor's (multiple doctors, even!) failed to rule out the #1 most likely cause, let alone more obscure possibilities.