Long awaited swimming

I think I have not swam for a long time... maybe near to a year.  

Last year my giddiness first hit me in Sep and I only know now that it is known as Vertigo.  

Ever since then, I have not went swimming.. Yoga I did resume because I remember the times I felt giddy when I suddenly stood up during yoga.. 

Today I went swimming.  I felt nice and excited.. I like the times in the water, feels relaxing and there is nothing in my mind except to reach the end soon.... 

But now my knees and calves are aching... sigh and I feel tired.... Thats why I should always keep the pace.....