Tubes can be a good solution. There's a book a nutrition counselor gave me when my daughter was born and I remember it had a section dedicated to ear infection problems. I think it's called super immunity through nutrition. I can't even remember the gist of it, but I think there was indication that some of these problems are caused by food allergies. Might be worth a read anyway b 4 going that route. If I find the book or remember the title I'll get back to you. Meanwhile, if you search the name I gave you'd probably find it.
Single parenting is a big job. What a worry to be alone during a child's illness.
take care