Well, first, you need to come to the realization of whether you are truly sub or slave. Once you do, it will help you decide where you want/need to be with this. You mention that being a slave means no choice....I disagree. I myself am a slave to my Master who is also my boyfriend of two years. When getting into this, we discussed it AT LENGTH what I will have say in and what I dont. Most of the stuff is my girls ( who he does NOT interfere with ANY decision I make pertaining to them at all), my getting new tattoos ( because its something I did BEFORE we decided to do this and also its a way for me to express myself) and my painting, which i also do to express myself. I also am dominant as far as other aspects of my life ( my girls, when Master actually lets me go out with my friends etc) but, in my relationship, EVERY OTHER aspect of myself is a slave. I LIVE and YEARN to please my Master and make him happy in every way... we TOTALLY live 24/7 TPE and it works for us....
It sounds to me like you have to discuss with your husband really want you both want out of this experience....If you are finding more about yourself then your husband is willing to give, then I really think that you should talk and discuss. I am constantly horny too and my Master LOVES it...MOST Masters or Dominants SHOULD want their subs/slaves horny...so the fact that your constant hornyness is causing problems should be a red flag.
My only advice is talk, discuss and find who YOU are as far as being sub or slave....