Does taking 600 mg of tablet Tegretol instead of 200 mg considered overdose?

Hello doctor,

I have the following question about the tablet Tegretol:

I have been taking Tegretol 200 mg in the morning and 400 mg in the evening for bipolar disorder for nearly two years now. I accidentally mixed up Tegretol with my allergy medicine yesterday morning and therefore took 600 mg of Tegretol in the morning. I realized that I took tablet Tegretol instead of tablet Allegra only in the evening. I finally decided to skip the evening dose of Tegretol and returned to my original routine today morning.

I felt quite awful throughout the day, but I thought it was only a migraine attack. I now believe I have overdosed on Tegretol to some extent. Is there anything I should do about this, or can I consider the situation to be settled?

Thank you so much for being so helpful in advance.

Kind regards.