Our expert says:
Rather a lot of meds to take all at once ! Antibiotics alone can have unpleasant psyche side-effetcs ( far more than people realize ), and depending on their ingredients, so can cough meds and cold meds and sinus meds. And all three can make one drowsy and woozy, with difficulty concentrating and feeling high. Dry mouth ( and hence thirst ) is typical ) and blurred vision ( fortunately not due to any eye damage, but to one's eyes being temporarily lazy in focussing ).
From what you say, the original combination was not at all wise, and all the symptoms which so alarmed you are likely to have been due to the sinus and cough meds.
Generally, if one has a Viral infection, like a cold or flu, one should NOT take antibiotics at first, as they have no effect on viruses. Only if later a secondary bacterial infection develops ( with colourful sputum, eg ) may one consider an antibiotic.
You should not have the same problems recurring on the antidepressant alone ( supposing that you are indeed depressed, which you did not mention in your introduction ), and starting at a low dose and then increasing it, while this might slightly delay the arrival of its benefits should reduce the side-effects if any.
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