Oblomov if he starts school in september, I think that you may have to sit tight.
Most groups finish this week for us, too.
TRy to get out of the house as much as possible, and chat to any mums you see in the park- you'll be suprised how keen people are to chat- we are all in the same boat.
Don't be afraid of asking them round/out for coffee etc. Many of the mumjs round here tend to meet up on particular days for picnics in the summer, as there are no groups.
You have to kind of treat it as though your matenity leave has started now, so adopt the strategies you apply with a new baby.
It is early days for the both (three of you) to adjust to the new situation- you could also look on it as an opportunity to meet some of the mums and children who will be at DS's school.
You may also find a decent local childminder who can take DS?
Sorry to sound like a lecture- I just really know how it feels- I was soo ill and very ow when pg with DD.