Dear Doctor, My Name Is Rani And I Am 42

Dear Doctor,
My name is Rani and I am 42 years old. I have 3 children all born by c section. I have a regular period every month with 28 days cycle till this month. My last period was on the 29th of December. On the 15th of January I start it bleeding again. I thought it was just a wound from my partner finger nail going in but after 3 days I start it bleeding like I am having a period. This time accompany by really bad smell from the blood. The smell just like really old blood and I can smell it really strong. I have to change my pad all the time because of the smell. I am a bit stress lately due to separation with my husband. Can you help me please what's wrong with me or what is going on with my body? Thank you for your help.

Kind Regards,

Rani