Feeling up and down sensation.

In October, I was journeyd in a bus , it was a 1 hour journey ( bus sickness problem). And the next day , when i  come from college , I feel my leg up and down type sensation during walking . I was not feeling this everytime, sometimes while walking i feel little quick up and down sensation . It was happened with me everyday for sometime . After some day , i was doing anxiety about these thing . (November, December, January) - I had worried too much about this issue and was stressed.I don't know whether these things are happening because of my anxiety, or whether the symptoms are actually occurring due to some reason. Some time .When I moved my head up and down, my head movement felt bad.  Now ----   When I walk, when the whole body moves smoothly, at that time sometimes it seems feel that my head is moving further back. Sometimes i feel my head up down sensation while walking. I feel this type of sensation .