What Causes Weakness In Legs And Stomach After Weight Training?

After weight training i felt a weakness in my legs and stomach.... two days later a bump came up in the area of navel..my dr told me i have an umbilical hernia however the bump next to my navel is called a bullous cystitis and received antibiotics to cure the problem. A surgeon however advised that it needs surgery to remove the cystitis and hernia....is that necessary? The only time my tummy feels tender is during my period....can u provide some feedback