What would you be doing if you weren't feeling emotionally numb? Do it!
We block our feelings because we have been hurt in the past, hurt enough that it is safer for us to feel nothing than to risk being hurt again plus the fear that if we let ourselves feel anything, everything will come gushing out uncontrollably and we'll mess everything up again. So we withdraw emotionally and live safe in our self imposed state of emotional isolation.
Give yourself permission to break the rules you have imposed on yourself to maintain the state of emotional isolation in some small way. Touch an safe, appropriate person in an appropriate way, the way you might if you didn't have all those rules. Let yourself enjoy the moment. Linger a moment, then go back to your safer pattern of behavior. But make a mental note of how nice it felt, make a mental note to do it again when appropriate.
Work at it at your own pace. When you feel you can't do some appropriate bit of caring behavior, challenge yourself. Ask yourself why. What is the rule you have imposed on yourself? Remind yourself your set of rules helped you survive the abnormal situation you had to survive, but now that you are no longer in the abnormal situation some of them are preventing you from letting yourself to enjoy and participate normally in your current situation.
Small, safe steps, initially feeling very awkward and even staged but gradually allowing you to accept that you are safe and no longer in the abnormal (traumatic) situation and it's ok to set aside some of the rules that got you through the abnormal situation.
Bit of caring, appropriate behavior by bit of caring, appropriate behavior the intense negative feelings related to the old stuff will be replaced by enjoyment of participating appropriately in your current situation. At least, that's kind of how it has seemed to work for me, though I started the process (with therapeutic support) too late for my role as a parent, but just in time for my role as a grandparent.
Ted