Looks like you are having a problem with your speech and hence feel that your tongue becomes numb while talking. You need to see if there is any new stress that you have been under, do you know if each one of us are reeling under the COvid crisis.
Next Steps
Do deep breathing and relaxation exercises.Avoid all stress or situation which causes your problem
Health Tips
Can consult if you are still not feeling better after doing these things. Thanks