I was having the same problem as you from about 20 weeks. It's so painful and a very distressing way to wake up.

My Ob told me to drink a small glass of Indian Tonic water each day and this has worked for me...mind you, it's not the nicest drink in the world!! I recommend a dash of red or green cordial (something with strong flavour!) mixed in to help it go down.

Hope this works for you. It was my saviour...and still is!!

Good luck!