There are lots of excellent treatments out there for dry, out-of-condition hair! However, if this has happened only recently, have you considered that there could be an underlying health issue which could be causing your problems!
Something similar happened to me a couple of years ago. My hair became very dry and tangled, just like yours, and it also became finer in texture. I wasn't feeling particularly healthy either - nothing specific - but I just felt a bit "under the weather".? When I visited my hairdresser, I mentioned it to her and she said that in ladies of my age (nearly 64 now) one of the commonest causes of loss of hair condition was an underactive thyroid! As I had postpartum thyroid disease after having my daughter in 1991, I have to admit, it certainly was a possibility!
I spoke to my GP about it and mentioned about my nonspecific symptoms! She did not take on board a single thing I said! ?. I didn't force the issue, but over time, things got worse! I worked as an Advanced Nurse Practitioner in general practice for many years before I retired and had a nursing career spanning over 30 years. I was also used to patients feeling they weren't being taken seriously by their GPs!
So, using my judgement and clinical knowledge, I arranged to have a series of blood tests carried out privately! Imagine how shocked I was to discover that my thyroid was severely underactive, and in addition my Vitamin B12 levels were also severely low - the latter was caused by medication prescribed by my GP to control the symptoms of acid reflux, as I have a hiatus hernia!?
I went back to my GP with the private blood test results and was immediately started on treatment! I also got an apology! I don't feel 100% yet, but I am much better, and my hair condition has improved too!? Good luck!