How do I help him?

My husband suffers from anxiety based OCD. I think he’s probably had it the whole time I’ve know him (15 years), but it’s getting more and more severe, particularly since we had another baby. He can’t drive as he keeps having to repeat his route, it takes him an hour to lock up, he is constantly anxious about the baby, and now he can’t sleep so is waking me up to double check baby is ok. The lack of sleep is making him worse. I’m struggling to cope with all this on my own. He was on medication but stopped taking it 2 months before baby was born as he had horrid side effects, and is now adamant he won’t go on any meds. He says he can’t do his job on meds but he’s going to need to stop work at this rate anyway. He went to the Gp who suggested he self refer to CBT, but it’s been 7 months and he’s not done it. I just don’t think he’s taking it seriously and isn’t seeing how it’s affecting others. I want to help him and be supportive but I don’t know how. A friend suggested an ultimatum but I don’t want him to feel like I’m against him. How do I encourage to get help in a supportive way? Does he need a wake up call like my friend says? She seems to think me being so supportive is actually making him think he’s ok... are there any other options as an alternative to meds or cbt? Please help me. Any advice greatly appreciated