Am I sick or just nearing a nervous breakdown?

I had had a very stressful few months. My young daughter who already has extensive medical needs (amputations, skin graphs, feeding tube, ostomy ETC.) had to have major surgery in early December. After 14 days in the hospital we got to go home Christmas morning. 2 days after Christmas my husband collapsed in our home and had a massive heart attack. 5 days in the hospital. At his two week followup the doc was still very concerned and several tests later we were told he needed quadruple bi- pass surgery asap. He is only 38. surgery scheduled for Feb. 9. Wed. they told us he needed to come in Thurs. for a cat scan of his chest ( we are assuming for is heart). We get a call at 9 pm last night saying that he will need to come in again for another cat scan of his head and neck. They are now looking for cancer because his lymph Nodes are swollen and his white blood count is really high. We have no health insurance as well. I feel like I am a pretty strong woman, and can handle difficult situations. But today as we wait for the phone call to come in I feel like I can't function any more. I just want to sleep and sleep today, that is totally unlike me . In addition to our daughter we have a severely autistic son. I am so worried because if my husband I sick it is all on me. maybe I just have a flu bug but what do I do if I am just reaching my Limit? (no family on either side to help)