Hi.
Mine was a month from diagnosis to the first treatment, I had lots of appointments prior to that which included a bone marrow biopsy, CT scan and MRI, It appears that all hospitals work differently and timescales vary for treatment for individual patients depending on what stage the Myeloma is at…
For me the breathlessness started to ease once treatment started, no medication for me for it, it wasn’t required still not 100% but better than before.
Good luck with your next appointment and treatment.