It depends on what is going on in your back. You need to wait for the results of the MRI. Usually activity will make things worse, so I would keep this to a minimal for now until you see the doctor and get worked up.
Inguinal hernia was ruled out but no one has looked at my lower back. I have an appointment in a few weeks with my primary so I will get a MRI set up. Is it normal for nerve/disk issues to come and go? Or is it more common to be bothered when sitting a certain way or involved in some sort of activity? For instance I didn't have any numb feelings in my foot yesterday but two prior to that I did?
Yes. Has anyone looked at your lower back and done any diagnostic imaging (MRI, CT) or your lumbar spine? There are nerves that come off the spine that can spread and cause symptoms as you are describing.
As long as the doctors have checked and ruled out an inguinal (groin) hernia and everything is fine there, then I would call your doctor and have him/her look into your lower back and start ordering tests for radicular pain (going to your scrotum) and sciatica (going to your foot). This most likely involves 2 or more nerves or disks that are involved if this is the cause. Should this be the problem, the next step is going to see a Neurosurgeon (not an Ortho MD). So when you have any films done, get copies of your films along withe the report to save yourself a trip.