I started having lower back pain a couple of days ago and now it is also in my lower left abdomen. Help?

See a doctor. I would be worried about the possibility of there being something intrabdominal causing your back pain. You should really get it checked out.
Get evaluated. You can try some basic over the counter regimens, but make an appt to be seen by your pcp to determine the cause of your symptoms (there are many). Heat and ice are also good options.