For twos days I've had slight numbness and tingling in the arch of my left foot, and slightly blurred vision. Now I have a small bump on my calf. Bad?

Be seen. It is really hard to say without the benefit if an exam and things, there are multiple causes from benign to more serious. I would be seen with particular attention to the complaint of blurring of your vision, which in general is not a normal complaint and can be seen in serious neurological conditions as it's first presentation; ms being one example. .

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I have had numbness and tingling in my left foot with soreness and itching at times the pain comes in my leg also. Could this be because I have sciatic?

Could be ! Sciatica is a common presentation of a disc in the back with pain and numbness affecting the sciatic nerve the symptoms radiate from the back to the back of the leg and sometimes all the way to the foot. Read more...
Nerve disease. In the absence of back pain the possibility of sciatic pain is low. Since symptoms are confined to foot and leg, a pinched nerve is more likely. Emg will help. See a neurologist. Read more...

Numbness and tingling esp face and left foot snd leg. Noticed more off balance and memory problems. What should I ask my dr for testing?

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