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these symptoms most likely are not related.
bleeding tongue can be from aphthous ulcers or cold sores on your tongue from a bad fever blister or cold sore break out
these can manifest when your immune system is low like if you are not getting enough sleep or are stressed or eating poorly.
red rash behind the ear can be eczema or psoriasis or something else. you might need a skin biopsy to help with proper diagnosis. it doesn't sound like you have seen a dermatologist to get a biopsy of this area.
stiff neck can be from poor sleep, poor neck support when you are sleeping, lack of flexibility and stretching of your neck muscles.
valacyclovir is used for herpes breakouts. have you had genital or oral herpes break out?