YOU SAID:
well ive got lumbago its very serious
INTO JAPANESE
腰痛になった
BACK INTO ENGLISH
I got a backache.
INTO JAPANESE
腰痛がした。
BACK INTO ENGLISH
I had low back pain.
INTO JAPANESE
腰痛がしました。
BACK INTO ENGLISH
I had low back pain.
That didn't even make that much sense in English.