((((Meggie)))
I am with (((Cece))) all the way on this one everything she said. I am sure it all seems over-whelming right now.
One semester is not that long of a time. Yea you might have to do some stuff that makes it harder but, H coming out of rehab to help just does not seem like a good idea besides in 3 months he will be out anyway. He can help when he gets out.
Too I think it will be good for your son to see that sometimes we have to sacrifice when making plans for our life. I was in college when my son was young. I worked full time and went to school full time looking back I don't know how I did it all those years and somehow or another I had time for my son. I was very fortunate to have a job that my son could come to with me. His dad was around too and he did help me when I had exams and other times too.
Keep it simple (((Meggie)))