Just started Brintellex 5mg a day for depression and A.D.D. (today is 3rd day). (I don't want to take stimulants for A.D.D.) Previously took Wellbutrin XL 300mg a day along with Cymbalta 30mg a day. I also have low thyroid and take Armour brand 60mg a day. I was aware of the likelihood of nausea with Brintellex, however I'm having either odd side effects, or perhaps withdrawal symptoms ? from discontinuing Cymbalta. I've noticed since taking Brintellex that I awake easier and feel very cheerful which is great. I then take a lower dose (150mg) of Wellbutrin XL, and 60mg of Armour thyroid. (Cymbalta discontinued when began Brintellex.) I wait for one hour because of thyroid med and then have breakfast. After breakfast I take 5mg Brintellex. Soon after taking Brintellex I feel slightly nauseous, (expected), but even more disturbing is the fatigue I feel along with a little dizziness, a little shortness of breath and a faster pulse rate. For past 3 days I've been just taking it easy after taking Brintellex until these symptoms go away after about 3 hours. Then I'll feel good again. However last evening (2nd evening of Brintellex and 2nd evening without Cymbalta) I began feeling fatigued and dizzy again with increase in pulse rate and shortness of breath. Could this possibly be withdrawal of Cymbalta or could it possibily be an interraction with the thyroid medication?