I'm so sorry for your loss catinb0ots. He looks like he was a lovely boy. He was so lucky to have had someone who loved him and cared so much for him for so long, especially so because of his blindness.
I know exactly how you feel. It is the worst pain losing a dog, especially after so long.
We lost our JRT earlier this month, aged 16. His passing has broken my heart. I think about him all the time, and see, hear and feel his presence, then get that awful sinking feeling when I realise it's just my memories. He was such a presence in our lives for so long that it's so hard to know I won't see him again.
The pain has eased slightly, I don't cry every day now, but I don't think I'll ever truly get over his loss.
I have found it's helped spending time with our other dog, particularly just now when I don't have work or other normal life activities to focus on and distract myself with. I collated all the photos and videos I have of him (took a while after so many years!). It helped to remember the many happy years we had with him, and diverted my attention away from my sadness.
For now, just take it slowly, do what you need to in order to get through the days and most importantly, be kind to yourself. Cry if you need to, smile at the memories, but know you feel this way because you loved and cared for him so much, and that is something very precious.
You have my utmost sympathy 