Pain in right hand wrist and muscles.

I used to give swing to my 1 year old kid in cradle continuously(1 hr) in night.I have pain and spasm in right hand wrist since 3 weeks.Specially a muscle on left side of right wrist which is connecting the thumb is much in pain that I can't lift heavy objects.Initially I applied Diclofenac gel and hot pack but spasm not cured.Later I consulted ortho,he had given painkiller and ask for continuing hot pack,but it was not cured. After 1 week I changed ortho and he did Xray which was normal, he gave zerodol-sp for one week and hot pack continue but it was not cured. I consulted again after a week (i.e 3rd week) He changed medicine to Chymoral-AP. And prescribed physiotherapy UST and SWD. I did all for a week,pain is reduced but not cured. Pain is bearable uptil now but unable to do any work. Physiotherapy doesn't work, neither anti-inflammatory. I asked doctor for muscle relaxant but he said it is not required.What to do now?Pl mention any muscle relaxant suitable during breastfeeding.