shin splints and knee inflammation

For the past 3 months now I've been suffering with what I think is shin splints.
Within the past 3 weeks I've now developed, what I think is inflammation of the knees. I went to the doctors twice and they said it mot probably is inflammation. I've had a blood test and now waiting for the results of that but I'm in so much pain and I can't walk properly without my shins and inner and behind the knees being in pain.
I've requested 5 days off in which I'm on my 2nd day off now as I have a physical job which hasn't helped my injury and I'm taking naproxin and icing the leg which I feel isn't working. I don't know what else to do! :(
I'm very down about it as I feel its getting worse as I feel I'm unable to walk on my legs without pain

Has anyone had this and what else can I do to heal it?
How much rest do you think I'll need as it's depressing just laying here most of the day...


Thanks