I had the bypass in August, and my blood work is perfect. There is definitely a small risk of having these issues, but by no means do the majority of people suffer from severe deficiencies and the like. In fact I've only heard form one person in my support group of several hundred who have had any real big issue. All other issues were easily fixed by changing the Vitamin regimen. I did lose some hair at about the 7 month mark, but now at almost 10 months, it looks pretty much completely back to normal. At 10 months I am now able to get in my required amount of calories and my health is honestly just fantastic.
The first 6 months or so were kind of a bummer, as it took me that long to start getting my caloric intake back up. I was often tired and cranky from hormone changes (both of which also happen with the sleeve very often). So the beginning may be difficult, but I can say with certainty that I would do it again a hundred times over if I needed to, and I would choose the bypass every time. My restriction is perfect, I have never had dumping, and I've lost 157 pounds in less than ten months.
Hope my experience helps you! Whatever you do, the people here are really wonderful and will always be around to help you in any way we can. In my opinion, it will be so, so worth it to take this leap. The chance of something dangerous happening is so, so low and the chance of dying decades early and suffering horrible health issues because of unchecked obesity is so, so high. In the end, any action you take to better your health is going to pay off compared to not doing anything at all. Good luck! Feel free to friend me or message me any time.