Pins and Needles,memory loss,Multiple Sclerosis?

I had something happen to me 2 years ago, and I never really thought much about it up until now.
I often have "pins-and-needles" sensation (mainly on my legs and arms, but normally only affecting one limb). Sometimes a couple times a week. Sometimes they last a few minutes.
Two years ago I went through an odd phase sort of thing. It started off when I fell down the stairs because my knees gave in. I thought nothing of it at the time. Then about a few days later I had the pins and needles in my legs, both of them, so I had difficulty walking and had to hold on to the wall as I slid my legs across the floor. This lasted about a minute or two. About the next day I had the same thing happen, but it felt as if it travelled up my spine and I had pins and needles on my arms as well as my legs. My hands were really tense and locked up in a position and I couldn't move them. That lasted about a few minutes. Then, the next day the same thing happened with it starting my legs, moving up my spine, and then in my arms, and then it went to my face and it felt like my whole face was numb and it was hard to keep down saliva. After my legs recovered and the sensation was still in my hands and face, I tried typing to a friend, but I had difficulty finding the key I wanted to press, and when I found it, I had a hard time getting my hand to press it. This lasted probably about 10-15 minutes. Afterwards I had difficulty remembering things that happened earlier that day when I was asked questions from a sibling. After that nothing happened afterwards.
I went to the doctor after that and they did a blood test but nothing was really done about any of it.
I was just wondering should I do anything about it or if I should just left what happened be.