hello i have a question.

i have had a lap band for 9 years and it has given me acid reflux. my dr wants to take out lapband and go a gastric bypass. iam a little nervous because i have heard of malnutriotion and deficancy issues . dr did say i could do a sleeve but i will still have acid issue and that bypass is better option.my only problem is i have hashimotos and very worried about vitamin deficiancy. i would appreciate any thoughts on this