It takes probably over 6 months for your nails to recover from chemo...and mine only did after multivitamins were added in my diet...so it's difficult to know if its herceptin or chemo side effects still. (I mean my haur grew back white initially and onky now 2 years on has darkened right down)
Breathlessness is something I had...and was found to have heart side effects. ..shown on the gated blood pool scan. (This can cause a cough also)
Make sure your thyroid is checked...if enlarged it can cause a cough.
I used to get very tired on day of herceptin. The sleep issues is common following chemo so it makes the picture confusing.