Like the others here I haven't personally experienced this situation but I did work as a counsellor for a carers organisation so I can give you advice from that perspective.
First off, you've done the right thing reaching out for help and support. As much as right now you have to care for your husband by yourself, it is important not to
feel that you are alone. There are many carers like you out there, and it is highly likely that most of us will become a carer for a loved one at some point in our lives. I have no idea what services are available in the US, but here in Australia and in the UK also there are organisations set-up to support the carer, not the cared-for. They can assist in offering free counselling to talk through some of your concerns with a specialised professional and link you up to services like respite and carer support groups. Does anything like this exist where you are from? A quick google search left me with nothing, but maybe you can do a better job of finding something. In the meantime, here is a link to Carers NSW (the NSW peak body for carers) at the very least I hope it can offer you some helpful reading material.
Carers NSW
Respite, if you can access it, is a wonderful thing, as rei suggested. It is so important to have a break from caring and to still feel like you have a life of your own. I read that you are having a number of alt. therapies and the like - bravo! Keep it up if possible. Self-care is so important and don't ever feel guilty for wanting it.
I suspect you are also grieving the loss of your husband's mobility and ability to participate the activities you used to do together. If this is the case, remember this is normal and understandable. A counsellor might be helpful in this instance and as mentioned support groups are another great resource.
I wish I could give you more specific help re the services available to you, but I can't I'm afraid. If you want to air any thoughts or concerns however, please do and I'll do my best to help you here.
G.