Slight tingling sensations in hands and feet?

I started experiencing a mild sensation in my palms and fingers ( mostly on the left side) about 8 months ago. I didn't pay much attention to them but they have become more frequent in the past 2 months. My occupation requires me to work on a computer constantly. I first thought this was the issue but i'm not so sure now. My feet are begining to have this mild sensation as well. I saw my Primary Care Doctor and he did all the blood tests that would be relevant to this and they were negative. He set up an appointment with a Neurlogist and I will see him on the 5th of August. The symptoms are very random, some days I don't have any symptons and other days may just be a breif occurance and they vanish. I have had a few times that the tingling was occompanied by mild aches in my forearms, clafs and ankles. Some weakness in legs with onset of tingling in feet, but still slight. I understand these symptoms have a wide range of possibilities. Any ideas before the appointment? Or what questions to ask at the appointment?

[Dr Rajgopal]

Hi,
There are many possible causes of the symptoms : Remaining in the same seated or standing position for a long time ,Injury to a nerve -- for example, a neck injury may cause you to feel numbness anywhere along your arm or hand, while a low back injury can cause numbness or tingling down the back of your leg ,Pressure on the spinal nerves, such as from a herniated disk ,Pressure on peripheral nerves from enlarged blood vessels, tumors, scar tissue, or infection ,Shingles or herpes zoster infection ,Lack of blood supply to an area -- for example, cholesterol (plaque) build up from atherosclerosis in the legs can cause pain, numbness, and tingling while walking (this is called vascular claudication); frostbite can also reduce blood supply and lead to numbness ,Other medical conditions, including: Carpal tunnel syndrome (pressure on a nerve at the wrist) ,Diabetes ,Migraines ,Multiple sclerosis ,Seizures ,Stroke ,Transient ischemic attack (TIA), sometimes called a "mini-stroke" ,Underactive thyroid ,Raynaud's phenomenon ,Abnormal levels of calcium, potassium, or sodium in your body ,A lack of vitamin B12 or other vitamin ,Use of certain medications ,Toxic nerve damage due to lead, alcohol, or tobacco ,Radiation therapy .Hope this helps you . Take care and regards !