I think it is possible that you have mild or situational depression.
You say that you are aware of your limitations, yet you do not want help from others. I think it is admirable and even preferable that you would limit help from others, but it also may not be totally appropriate or healthy to refuse help when needed. This could help to relieve undue physical pain or the stress related to that pain at least for brief periods of time. In addition, I think it is possible that those who love and care for you (us) really WANT to help us and if you were to allow them to hep (without taking advantage of the situation and that certainly would not be the case here), then it would give them some relief to know that they were of assistence. You did not ask for this pain and therefore it is okay to receive help when the burden is great. You never know, but there is a chance that if you receive help now and again, this would lighten your load and in your own way, and could allow you windows of opportunity to help others in some unexpected way.