After a Botox injection on my forehead I woke up with deep grooves on my forehead in a diagonal shape of a 'W'. Help?

Thank you for your question.  Sorry to hear that you are having some concerns about your postprocedure appearance.  It is difficult to comment without seeing a photograph, but what you are describing is most likely related to swelling.  In general, swelling at the site of Botox injections is normal and typically resolves completely within an hour or two after injection.  Botox will start working in a couple of days.  You will see your final result 2 weeks after treatment with Botox.  In general, icing can help to reduce postprocedure swelling for up to 48 hours after the procedure.  Arnica can help to minimize any postprocedure swelling and bruising.  What you are describing is unusual.  I would advise you to see your injector for an in-person reevaluation in order to best address your concerns and to determine the best course of action.  Best wishes! 

Give it a full 7-10 days to settle, but it may be that you will need additional Botox units if the forehead muscles are not relaxing evenly. BestLisa Vuich, MD