Infant reflux

My six week old has been suffering from reflux from her second week. When I spoke to her ped, she said she required no medication as she is Happy Spitter and gaining good weight. However, the reflux has not decreased. She suffers for a good 45 minutes to an hour after her feed. That is also how long she takes to burp. She needs to take 3-4 burps before I can lay her down. She twists and turns if I lay her before the 45 mins window and spits up and then settles.
Last week, she became constipated for the first time. I was very worried and took her to her Ped on the third day of no bowel movement. Ped prescribed glycerin suppository which I gave her. Sadly, the relief lasted only for that day. 2 days later, I had to give her the suppository again. Then on my mother's suggestion, I gave her Nux vomica 30 c 2 pellets (this is what my mother did when we were kids) and it seemed to work magically. She began her regular bowel movements which is twice-thrice a day. Last evening, I gave her the second dose of 2 pellets just before her bedtime. However, this has coincided with her shots which she got on 24th.

There is an increase her spit up which is almost like vomit ( in quatity) now. She is very uncomfortable and is arching her back every time I lay her down and there is twitching added to the twisting and turning as well. She did not sleep well the whole day. She took shot naps of 10-15 mins throughout the day instead of her regular 45mins - hour and half naps. I'm not sure if this the after effect of the shots or NV.


What is the remedy for her reflux? Can I keep giving her Nux vomica till her bowel movement become regular again? Is twitching of muscles normal? Do I need to be concerned?
She was a happy and content baby with good number of wet and soiled diapers before constipation started. The reflux was the only issue she had and it didn't seem to bother her as much as it does now. Please help.