Is it possible that you're assuming he won't understand or that you fear judgement?

You should never feel like you have to censor or alter your expression or subject matter to accommodate your therapist. You're the client. You should feel like you can talk about whatever you need to talk about.

Mind and Body are connected. Hormones are a real thing. They affect how we feel. Our bodies impact our mind as well as the other way around. Any psychologist or therapist should understand this or the field of psych meds wouldn't exist at all.

So yeah, tell him all about it, I'd say.