No, your husband shouldn't need any special vitamins or additional vitamins in light of his surgery. To ease your mind on this you can have him get a CBC in a few months and have the doctor check his vitamin B-12 levels. Provided his terminal ileum was not damaged he should be absorbing this.
Things will continue to get better over the course of the first year. It sounds as if he is adapting well.
dx proctitis in 1987
dx UC in 1991, was stable until 1998
1998 started prednisone, asacol, pentasa, nortriptylene, ativan, 6MP, rowasa enemas and suppositories, hydrocortisone enemas, tried the SCD diet, being a vegetarian, omega 3s, flax, pranic healing, yoga, acupuncture, probiotics
2000 lost all my B-12 stores and became anemic
2001 opted for j-pouch surgery- now living life med-free