If you are still having abdominal issues one year post birth I would suggest you see a physio who specialises in pregnancy and post birth issues. Normally there would not be such a large gap still so it is possible you need to do specific exercises to strengthen the whole area.

With your hemmaroids, there is lots you can do. Consider using a hemmaroid cream (really helps with the itching), and make sure you don't strain. Take your son in with you if you need to, or try not to go unless he is having a nap if you can. Also drink lots of water and eat plenty of fibre, and that way even if you don't have much time you still should not be straining.