Welcome to HCM.PCOS
can be ignored if you are married and have children.
If you are unmarried wait till you get married, for treatment to start.
If you are married and you do not have children then you should certainly take medicines, so that you may conceive. Once your family is complete you do not have to be bothered about the regularity of your periods. Let them come when they want.
As for your mom's condition, medicines are not very useful except to relieve pain temporarily. Surgical correction of the disk compression may be required.