Dating LDR

There's a submissive guy, I've been talking to long distance. I haven't told him about my disabilities.He lives in the UK. My fet profile does days disabled tho but not specific.He says phone calls make him anxious. It's just I feel awkward disclosing my medical stuff over texting. He says he prefers voice notes. We've been texting for almost 3 months. Maybe I waited too long to tell him. Im also going to get surgery soon for Endo. It's mostly been sexual exchanges because he says that emotional vulnerability is hard for him. I really like him and I'm willing to wait till he feels more comfortable having a ohone call. However what do you guys think ?