WW, as someone who has done counselling for my church (and been counselled), I can tell you a couple of things.
1) It is VERY stressful, and you have to put up with a lot of people who are just basically wasting your time, because they cannot change. They just need a sympathetic ear to give them some attention, so they can vent about their problems.
2) You will need a good support system. Those who do it through the church on a regular basis have LOTS of prayer backing, and usually do it as a husband/wife team so they can support each other. They also take regular breaks and vacations from the counselling to recharge their batteries.
3) You have to REALLYREALLY have your own act together in order to do it, or you will burn out. The biggest problem is letting go of all those you have counselled at the end of the day, and not carrying their burdens into your personal life. And, having listened to all the various trials you have weathered in your life the last couple of years, I'm not at all sure it would be the best choice for you. It sounds like you are under a lot of stress already, with your mom's illness, and your own health.
Why don't you talk to some people who do this sort of work for a living, to get a better idea of the pros and cons of the job? That would give you a much better sense of whether it is the right choice for you.
I wish you the best of luck, whatever you chose to do!