I'm currently seeing a physio for this issue 5 months post partum and only just starting to see an improvement.
Do not practice clenching in the middle of a wee. When you tighten your pelvic floor it relaxes your bladder muscle (the one which contract to make you wee) and when retraining your bladder this can be unhelpful and increase risk of UTI.
Please go and see your GP and ask for a referral to a physio.
In the meantime do your pelvic floor exercises three times a day starting by tightening the muscles around your bottom and continue to tighten the muscle working towards the front. Make sure you breathe normally. You should be able to feel the tightening all the way round to the front and even a pull in your lower tummy Start by holding for a count of two or three for five reps. Once you can hold for the full count and feel the release of your pelvic floor muscle at the end of the each each count then you can increase the count.
The issue one poster mentioned with relaxing your muscles to see an improvement is that if you're over working your muscle they can become tight and sore, which means they become ineffective. Try tightening your muscles to only 50% rather than a full clench when performing the exercise and as soon as you can no longer feel the release at the end of the count stop exercising and rest.
In the meantime you can help control leaks by tightening your pelvic floor before coughing or sneezing. The pelvic floor should automatically contract before your sneeze/cough but sometimes that auto trigger stops working after childbirth and needs to be retrained by consciously clenching. Placing your hand between your legs and applying pressure before you sneeze or cough (or running to the loo) will also help. A rolled up tea towel between your legs when sitting can help. The pressure has the same effect as clenching the muscles in helping your bladder muscle to relax and relieving the urge to wee.
Yes, it's true that after childbirth it is likely that your Pelvic floor will not be the same, but you should still seek professional help to get you to a point where your control is as good as it can be. It's totally possible that with a physio examination and guided exercises you could see some improvement. I don't know about surgical options but I have heard of Botox injections in the bladder wall to relieve an over active bladder muscle.
Please report the wanker Dr to the hospital so that he receives some training and a verbal kick in the bollocks
I hope that's been some help and that you see some improvement very soon