I would like to help you with your question.
I am sorry for the loss of your mother. I can only imagine how difficult this is as you were not only a daughter, but a careprovider as well.
The symptom you are describing - distraction - is a very common reaction to stress. Your mother's cancer diagnosis, your becoming her careprovider, and then her ultimate death were all stressful events in your life. Your ability to stay focused was compromised by these events and it became more pronounced and more noticeable as the stress mounted.
What often happensunder these circumstances is that your mind is operating on automatic pilot...it's as if you are not aware of what you are doing or even what you are thinking. Instead..your body is going through the motions of life and your mind is somewhere else. In this case...you aren't concentrating on driving..but rather your mind is wandering outside. You put down your phone without even noticing or thinking about where you have placed it.
One way to think about this is that your thinking process is moving through Jello....it's not easy to think clearly or normally as the weight of the jello is blocking your way. The distractedness you are experiencing is a result of your brain/thinking process being unable to handle the task of sorting, remembering, forming ideas, making decisions, being logical...because it is mired in jello - jello being stress.
The likely reason the physician prescribed celexa is that he/she was attempting to address the agitation..which he/she interpreted as anxiety
. That it made your mind "race" may have been because of the dosage, the fact that your body was still adjusting to it, or perhaps it interacted with another medication you are taking. I suggest that you schedule another visit with the physician for a re-check to better understand what happened and to talk about how to address your feelings of agitation.
It would be important for you to address the stress you are experiencing. Do you know what is stressing you out? One thing to consider is your reaction to your mother's death. That cannot be easy for you and you are still in the early months of grieving. Perhaps you would consider a grief support group. Such groups are a wonderful way to get support, to better understand the grieving process, and to work through your pain. I would also suggest you read
Remembering With Love. Messages of Hope for the First Year of Grieving and Beyond.
This is a bestselling book about grief and I highly recommend it.
Please know that the agitation and distractability you feel are likely situational..meaning they are tied to an event or events..and are unlikely to be permanent. Taking medication, attending a grief support group, lowering your overall stress..are all ways to help resolve these symptoms.
Please let me know if I can be of further help.