Why do I have mild pain in leg vein?

Swelling and itching near the bite, tired legs, and muscle heaviness are likely due to the dog bite and the vaccine. Your body might be overreacting to the vaccine. The hamstring pain in the other leg may not be related to the bite or vaccine. Use cold compresses and OTC antihistamines for itching and pain. Rest your legs and avoid physical activity to ease fatigue. If symptoms persist or worsen, consult your doctor. Ensure rabies prevention by following your doctor’s advice.

When you mention neck pain for the last 10 days, do you mean a burning sensation in the upper part of your neck? Also, have you felt pins and needles in your left hand and foot? These could be signs of a nerve problem due to the alignment of your neck bones. A medical professional should scan this area to find the exact cause and prescribe the proper treatment, which may include physical therapy or medication if necessary.

Acupuncture helps in opening up the energy level ( commonly referred as 'Qi' in acupuncture theory).
Acupuncture needles are put on various parts of the body which helps in increasing the blood flow.
It has an anti inflammatory effect. It stops body's inflammatory response, increases blood flow and relaxes muscle tone. It helps in flushing out toxins from the body. Acupuncture releases endorphins which are natural hormones to reduce the feeling of pain and puts the patient in ultimate relaxed state i.e feeling of well being.
Electro acupuncture pulsates electric current through the needles.
Such procedure gives quick response and helps in reducing both pain and inflammation in people with arthritis.