Hello,
From what you tell me, stopping the citalopram is very possibly the cause of your symptoms. In fact, you may be experiencing what are called withdrawal symptoms related to the sudden cessation of the medication. These symptoms just happen to include dizziness, fatigue, headaches, irritability and more.
Normally, when taking a medication like citalopram for more than 1 month, it is recommended to gradually decrease the dose over 2 to 4 weeks if you wish to stop the medication precisely to avoid having withdrawal symptoms. So, with the fact that you took the drug for 2 years, when you decided to stop the drug all at once, your body reacted with the symptoms you are currently experiencing.
The duration of withdrawal symptoms varies from person to person. For example, it could be from 1 to 10 days. You can wait for the symptoms to pass. However, I recommend that you talk to your pharmacist about this. One option would be to take Citalopram 10 mg (1/2 20 mg tablet) for 7-14 days and then stop the medication. This would help with withdrawal symptoms. It is important to discuss this with your pharmacist (on-site or phone advice).
Don't hesitate if you have more questions!
Jonathan Fournier, pharmacy student, under the supervision of Alexandre Chagnon, pharmacist