Stay home with him. He NEEDS you. The best thing for him is to be home with his Mama. That's what will mean the most. He will only be small for such a short time, and you will have missed this opportunity.
Lots of people say, "I wish I could stay home, but I just can't afford it." Do whatever it takes to make it happen. My husband only makes $35,000 per year, and we have 4 kids 4 and under. Last year, I watched one extra child to make some money when we needed it, but this year we've been okay. I didn't think it was possible to make it on only his income, but we have been doing it for 3 years now. I don't even miss the cable anymore, and it's much more special to go out to eat only occasionally than all the time.
Make your son and his needs a top priority and be there for him. NO ONE can love your son like you do. Not even the teachers he had that were experienced. Check out the website: http://www.daycaresdontcare.org/index.htm. I worked in preschool for 6 years before I got my teaching degree. I KNOW what goes on in daycares and preschools; there are good things, of course, but nothing that can compare to a Mama's love and attention. Like you said, your son is looking for attention. He DESERVES yours!
This is probably not the advice you were looking for, but you did say, "Open to any advice..." I hope you'll truly consider this.