I would make it a point to get it checked at your very first convenience. The condition you describe definitely sounds like a reaction to the
zoloft/sertraline. It's not really common but it is a fairly well-known reaction to your medication.
If you will enter sertraline into the search box at the top of this page and click drug search you will pull up links for information on this medication. You will notice in the section describing possible side effects that your reaction is discussed in some detail. It states that you should contact the dr immediately about this as it is likely a reaction. Let us know how it works out. God bless.