OK, I thought about it, Sankaran is right.

Here's what I would do. This doesn't sound like an acute case, so I would give, in water, with succussions before each dose, either Phos. 6C three times a day, or Phos. 12C once a day with the following warning:

If there's a striking improvement, or aggravation, or the appearance of new symptoms,
or return of old symptoms, stop the remedy.
In the case of an aggravation, an amelioration may follow. In that case, if there is a relapse, resume the remedy, but scale back the repetitions.

Give the remedy at least 2 weeks before giving up on it. It might even take a month, though I usually see results sooner.

Keep us up to date.

Snoopy