Yes, tetanus vaccines do contain diptheria as well and it is possible to have a nasty reaction to them. I do not normally have vaccines at all myself, but had to get tetanus, diptheria and polio for work and the day following all these, I had a horrendous reaction and was really sick. I am lucky that I have a really good ND who was able to give me a homeopathic remedy to help clear out the ill effects of the vaccines. Polio can live in the gut for upto 6 weeks and can give you stomach problems.
Sometimes it is a build up in the immune system the causes a reaction to happen and it is possible to have a bad reaction even if you have not had one before.
Also, I don't know how old you are, but if you are healthy, have a good immune system and no other medical problems, then you should not really be getting flu shots. If your immunity is good then you don't routinely need to have this as your immune system should be good enough to fight it off and anyway, you can take Vitamin C and Echinacea to raise your immunity.
I would suggest that you go and find an ND or a homeopath in your area. There is a remedy called THUJA that will help get rid of ill effects of vaccination, either this remedy or SULPHUR or SILICA are also good, but THUJA is best known for this. Also it is possible to give you the vaccinations back in potency and this should help.
Please go and see an ND, as they will definitely be able to help you. An ordinary MD would probably just fob you off.