I took Tofranil, which is in the same family (TCA). Elavil is more sedating than Tofranil. Its considered very effective. Have you asked a pharmacist about the interaction with Prozac? Multiple antidepressants at a time can be trickys, because each drug can increase the blood levels of the other drug(s).
Other than that...there's an old school combo pill, Triavil, that has a low dose of an older, sedating antipsychotic (Triavil/perphenazine) with Elavil, in one pill. Perphenazine is one of the more tolerable older antipsychotic drugs. Its compared well with Zyprexa in head-to-head studies. Triavil is generic and should be cheap. Just a thought.