。
I'll come see you once I'm better.
Literal
Well become-たら visit-ます.
~たら for the 'when (hypothetical sequential)' meaning — 'once X happens, Y.' 伺う is a humble (kenjougo) verb for 'to visit, ask, hear' — the polite way to say you'll come to someone's house. A standard polite apology for being unable to visit while ill.