OP, you need lab work. Some on transdermals get HPTA shutdown, elevated E2 levels and resulting T levels can be lower than prior to starting TRT. We see this quite often. If you read posts and stickies, you will see that transdermal non-responders are often also have some degree of hypothyroidism. So this can be regarded as a symptom of that. If you have that, your only recourse is injected T. Some docs will out of ignorance, just keep increasing the dose of the transdermal - that does not work and simply increases E2 and problems.
Some have normal thyroid function and simply do not absorb. Some do for a few weeks then not.
Test TT, FT, E2, PSA
Elevated E2 can aggravate a preexisting BPH situation or lead to that longer term. Estrogens are a bigger risk factor for prostate problems than T or DHT. Managing [with anastrozole/Arimidex] E2 levels is vital to a good outcome. Rarely not needed.
You should have had a baseline PSA before TRT and a DRE [digital rectal exam].
Read the stickies. Understand T+hCG+AI
We need your age, height, waist side, and fasting serum glucose for context.
You should review the symptoms of hypothyroidism to see what fits. Unfortunately, many of those symptoms are common to hypogonadism as well. Another common consideration is syndrome-X aka metabolic disorder, which also leads to increased rates of BPH.