There several types of surgery for hernias. Some of them include using synthetic mesh. Some of them using biologic mesh. My last surgery used biologic mesh made from a cow's myocardium. It was faulty and I had a massive infection that caused me to have an 8" by 12" cleaved open wound which took nine months with a wound Vac attached to my wound to heal. I had to fire the surgeon to get to a wound specialist who finnally cultured the wound...a request that I posed several times to the surgical team but was not heard. It turned out that I had e-coli and strept in my abdominal cavity. they put in a pic line into my brachial artery and fed me very serious antibiotics for three weeks thus saving my life. This site will help to increase your knowledge about hernias...I still have a fist size tolerable hernia. It doesn't bother me but I had those internal wave like pains very frequently before. Mary
www.hernia.org

Had my RNY in 2001 and was diagnosed with sticky blood syndrome (I clot too much).  SO I must take coumadin the rest of my life.  Yeahhhh! Right?  No Wrong! cuz if you have any bleeding from your intestines you will become iron difficient...I could not tolerate the oral iron so I get IV iron 1X per week.  They finnally discovered that the bleeding was coming from the mouyh of the old stomach  caused by bile reflux erosion...what to do about this??? 

I have read that some people need to go to weekly shots, but know of anyone in particular. Some people seem to have more problems getting enough B12 than others.
I am only 9 mos post op and have not had any problems with B-12 yet. However, I decided early on to use the B12 patch as opposed to the sublingual B12. The ad claims that it is as effective as injections because B12 can be destroyed by digestion and being absorbed transdermally, this is prevented. I use one patch a week.
They are a bit pricier than tabs, but this is something I wanted to hopefully forever avoid and am willing to pay the extra. You can only find them on the internet, do a search for B12 patch and you will find them. If I were you, I would probably start with 2 patches a week or more but maybe talk to your doctor, I'm not sure off hand how much is supposed to be delivered with each patch.

Boy am I glad to hear someone else experiencing this.  My surgeon, PDP and Gastroenterologist seem to know nothing of this complication w/RNY.  I have found I get light headed if I do not eat every 2-3 hours, and have come up with blood sugar tests as low as 50 moments after eating.  I would really love any information anyone can provide.  Pre-op I never had any symptoms like this, nor did I have early signs of diabetes.   Good to hear others in the same boat!  Wish I had some info to share... Renee