Why am I experiencing breathlessness and body weakness after TB treatment?

I have used the first step medication and the second step over and over and over again.. Firstly, i have a positive tb back then in 2022 and i treated it and used the first step and second step completely for 9 month but i do missed doses somedays. So when i told my doctir that the nine months has comleted and he told me that i should stoped, but later on in the middle 2023, i started feeling some pains, body weaknes, chest pain as if the tb is actuve, i inform my doctor about how i am feeling and he said i will have to start using the medicine again, i ysed it again for over 12 months, thats till 2024. i stop as at the mid of 2024, i feel okay and better throughtout 2024 till 2025. On september 3 / 2025, it was an evening when i finish taking my dinner, suddenly i suddenly im breathlessness, like im short of breathing, my whole body weaks, i cough, i cant work on my own, i think im about to passed out. i inform doctor the following day and he told me i should be using the drugs.