Why Don't I Get Permanent Relief From Typhoid ?

Within past 5 months I have had 3 full course of typhoid but.. Eg. if the treatment is over today, i will again get back the symptoms within 4-5 days. The symptoms are mild fever at evenings, chills, headache , body ache, lethargy , abdominal pain , weakness. Note that I never had severe symptoms by God s grace, may be because the first time I had the luck of getting it tested before it could show severe symptoms. When I heard that other people lie in bed for days I feel that I could have some other disease apart from typhoid. Can it be? But Widal test came positive too. Even, I have had overdose of 5 days of typhoid tablets (5 days monocef injection twice daily +cifloflxacin 5 days and monocef tab. again for 5 days) so that I might not catch it again but this time it took 10 days for the symptoms to come back... Now, we drink aqua-guard water and my family drinks it too but they don t have typhoid. May be my immunity is very low after so much allopathic medicines but what to do now. TB test is negative. I have 2 questions- 1. How to get permanent treatment. 2. What other disease could it be... any tests other than widal test?