I have found lately that when I get excited or start a good laugh my knees get weak. If I m holding something in my hands I have to put them down because I loose the power in my arms. It s like my body goes weak and I can t control my body for a second until I stop laughing which I instantly do. What could that mean or be?
Degree understand your concerns went through your details. I suggest you not to worry much.  Feeling week after a state of excitement is normal. Body spends a lot of energy during the state of excitement. When I say it is normal, you must understand that it is general and body has a lot of strength left to come back from that tiredness. I think your current situation arises out of you obsessive thoughts. You obsess with that tiredness and when such an excitement comes, body automatically completes your wish. Just ignore the problem and there goes the problem. If you require more of my help in this aspect, Please post a direct question to me in this website. Make sure that you include every minute details possible. I shall prescribe the needed psychotherapy techniques which should help you cure your condition further. Hope this answers your query. Available for further clarifications. Good luck.