Relieve some of your stress by reading up on your loved one's condition. I say that because if you're like me, you're probably scared. You don't know what's coming down the pike. You detest surprises, and ever since your loved one fell ill, your life has been full of these shockers.
There's no way of eliminating all the surprises, of course, but if you understand the illness(es) of the person you're nursing, then you can better predict his behavior, and can prepare yourself for what may happen in a month or in a year. You might also consider attending a caregiver training program. A recent study showed significant improvement in the quality of life of caregivers who received training. Finally, two books I recommend are "The Caregiver Handbook: Powerful Tools for Caregiving" and "Caregiving: The Spiritual Journey of Love, Loss, and Renewal."