First of all, welcome to HealingWell and the Depression Forum.
I am sorry you are having a tough time. May I ask if you have ever been to a therapist? Also are you on any medications?
It may be time for you to make an appointment with your PCP for a medical screening exam to rule out any medical problems that may be causing you to feel so down.
That said, I am the depressed wife and my husband has stood by my side even though there are times when he just feels so hopeless and may say " I don't know what to do to help you" I always tell him that he is doing what I need most which is just being with me.
We have been married for 37 years and I have had depression for 27 years.
Also your PTSD would benefit from therapy. Remember your therapist is there to work with you and this is where you may say whatever you want to say or need to say.
When your fears have the best of you, it is easy to feel that things will not get any better. This is not true. There is much help available in today’s society and the best way to deal with your fears is to find effective ways to overcome them. Instead of focusing on doom, stay in the moment. Give yourself breathing space. Consider what matters to you. Establish a few manageable goals, then take small steps toward achieving them
Please know coming here is a wonderful and courageous step. You are voicing your fears so you know what they are.