I am facing anorgasmia and difficulty in erection after taking Primidone for tremors. Why?

Hi doctor,

I am a 28-year-old male who suffers from an essential tremor on upper limbs (hands, limb, and voice). My neurologist put me on Primidone (Mysoline) 125 mg every morning and 125 mg every night at bedtime. My tremor has improved, almost disappeared, but I have no more libido. I also have difficulties with erections and anorgasmia (even during masturbation). I cannot take Propranolol because I have allergic asthma, so nonselective beta-blockers are contraindicated. I cannot take Gabapentin or Pregabalin because they caused respiratory depression during the night (I have sleep apnea). Could Primidone (and its metabolite Phenobarbital) cause such sexual dysfunction? I know some antiepileptic drugs can induce CYP450, and specifically, Primidone and its active metabolite are inducers of CYP3A4, and there are interferences with aromatase reaction involves testosterone. I had a sexual hormones blood check done last month.

1) TSH is 4.56 mlU/L.

2) Prolactin is 44.01 ng/mL.

3) Testosterone is 4.8 ng/mL.

4) SHBG is 13 nmol/L

If Primidone could cause these side effects, can I switch to another medication? If so, how should I do the titration of the new medication (and the withdrawal of Primidone)? And, if not, what could be done to treat my sexual dysfunction? Kindly help me.