Thanks for the query to H.C. M. Forum.
As you mentioned that he feels dizziness
when get from bed , this may be due to postural hypotension
Difficulty in breathing may be also due to hypotension.
As your query is whether it is Rheumatoid arthritis
or not .
Without knowing any complete history , how it is possible to say about R A.
Please get in blood for Rheumatoid factor
as well as E S R ( in R A , usually it is very high).
If you have any doubt diagnosis than consult one more physician ( rheumatologist
) and get his opinion.