I am with Beth in that a rash over, my gosh, 1/4-1/3 of your body !!! means a flat out NO. The source of this terrible allergy needs to stop.

In terms of the periods, I am of the opposite opinion to Beth's IFF the source is Kyleena and I do not know if Kyleena can make periods stop. I am on Mirena, which is bigger than Kyleena, and Mirena is known to make periods stop in 20% of women and mine stopped: have been on Mirena since 2004 (several IUDs have been swapped since the first was inserted in 2004), have never had any gynecological problem, am 51 now. Note that I had not had any gyno problems before Mirena, so it is not that I was prescribed Mirena to treat them–I simply got it for contraception. Many women get prescribed it for gyno problems and it actually is associated with a decreased risk of endometrial cancer and a decreased risk of a few other baddies. Hormonal IUD (Mirena) - Mayo Clinic. In your case, since hyperprolactinemia from Invega and possibly the IUD both can contribute, the only way to figure out what contributes to no periods is to stop the Invega and try another AP, which would have the benefit of removing the source of the allergic reaction.

In general, I think that Invega is justified when other APs do not work, but one should try other APs to exhaust the options.