I need to know if I am disabled or not.?

I have worked a public job,mostly very physical,and a lot of mental work,I worked for 31 years,Im now 48 years old,had back surgery,corpal tunnel in both arms,degenerative disk disease,severe arthritis,buldging disk's and 2 herniated now,I am a basket case with the loss of my abillity to satisfy my need of accomplishment,I cant even hardly wright a sentence that is readable anymore,I dont want to fade away any farther,but it seems inevitible,I cant create any income for myself or my family,Im so ashamed of how my body and mind has given up,help.Im not asking for any financial support in any way,just some advice.