Hi Lauren .....
Sorry the tinnitus is giving you fits. I, too, had no tinnitus pre-surgery, but do now post-surgery. It did not start in right away, but like you, gradually progressed for several months. I really do not think it has changed much since about a year post-op. However, it does get louder when I am stressed or very tired ..... and strangely, it is always louder when I am in a very noisy environment (like a busy restaurant) or a quiet environment (like at night when I am trying to go to sleep).
I am not SSD. I retained about 20% of my hearing and wear a digital Widex hearing aid. I find that when I wear my hearing aid the tinnitus is much less. My audiologist explained that the enhanced hearing gives my brain something to focus on besides the noises of the tinnitus.
Hopefully other BAHA wearers will have other suggestions.
Best thoughts. Clarice