Hello and welcome to just answer.
I am a double board certified clinical doctor and I have handled this problem hand on for more than 20 years.
You can not effectively treat these problems on your own.
In fact, there is likely lower spine involvement with the heaviness in the legs, and this can be serious.
You must see a doctor.
It is likely you need an MRI of the lower spine.
The mainstay of treatment will be the correct physical therapy.
And other manual therapies.
At your age, with this problem, the structural problems must be corrected. If medications are the only think used, then it is likely the problem will progress.
That is no good.
Best doctor to see: physical medicine and rehabilitation. A type of MD.
Your doctor can refer you, but many of these doctors, being medically trained, do not require a referral.
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